DCT will be performing the theme song for a movie called "Tsunahi chatta! ~Play at tug-of-war~". The song's called "Aishite Waratte Ureshikute Namida shite", it's described as being a happy song. The movie trailer also shows a short preview of it.

It does indeed; this is the lyric, the cover art, and a sound bite. Apparently, this was a limited release only (with stuffed warukuma!). It is not their 52d single, as far as I know. Not bad, though...